def add():
    a = 3
    b = 5
    s = a + b
    print(s)
    return a

def add(a,b):
    print(a+b)


add(1,3)

a = 1
b = 3
add(a,b)

add(2*3,4*5)

c = 3
add(8,c*3)

def score(a,b,c):
    print('三成绩为:', a)
    print('四成绩为:', b)
    print('五成绩为:', c)


score(85,92,60)

def reg(name,age,sex="女"):
    print('姓名；{} 年龄{} 性别：{}'.format(name,age,sex))

reg("三",20)
reg('四',21,'男')